a = int(input())
print("Yes") if a >= 30 else print("No") a = int(input()) a int(input()) int input() input print("Yes") if a >= 30 else print("No") a >= 30 a 30 print("Yes") print "Yes" print("No") print "No" a = int(input()) int(input()) a
a = int(input())
print("Yes") if a >= 30 else print("No")
